A routine blood test alone will not reveal pneumonia, but only a high blood count. If the blood picture is high, such as high white blood cells and neutrophils, it is considered a bacterial infection, possibly bacterial pneumonia, and also needs to be combined with clinical symptoms, such as the presence of fever, cough, sputum and other manifestations to jointly analyze and diagnose. The blood count also needs to see if there are low white blood cells, high or low lymphocytes. If there are symptoms of viral infection, it also needs to be analyzed together with clinical symptoms, such as whether there is chest tightness, cough and general malaise, etc. In addition, normal blood count does not exclude pneumonia, such as mycoplasma and chlamydia infection pneumonia, will also appear normal blood count.